<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.0.8</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>98</ContextCount>
  <ElementCount>287</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>30</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Condensed Consolidated Statements Of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements Of Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1004000 - Statement - Condensed Consolidated Statements Of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/CondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements Of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004501 - Statement - Condensed Consolidated Statements Of Cash Flows (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/CondensedConsolidatedStatementsOfCashFlowsParenthetical</Role>
      <ShortName>Condensed Consolidated Statements Of Cash Flows (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Organization And Summary Of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Real Estate</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstate</Role>
      <ShortName>Real Estate</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Line of Credit Payable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/LineOfCreditPayable</Role>
      <ShortName>Line of Credit Payable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Notes Payable</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.nnnreit.com/role/NotesPayable</Role>
      <ShortName>Notes Payable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Notes Payable - Convertible</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.nnnreit.com/role/NotesPayableConvertible</Role>
      <ShortName>Notes Payable - Convertible</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/StockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Earnings from Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/EarningsFromDiscontinuedOperations</Role>
      <ShortName>Earnings from Discontinued Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Derivatives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/Derivatives</Role>
      <ShortName>Derivatives</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Organization And Summary Of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2301302 - Disclosure - Organization And Summary Of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - Real Estate (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstateTables</Role>
      <ShortName>Real Estate (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2307301 - Disclosure - Notes Payable - Convertible (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.nnnreit.com/role/NotesPayableConvertibleTables</Role>
      <ShortName>Notes Payable - Convertible (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/StockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Earnings from Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/EarningsFromDiscontinuedOperationsTables</Role>
      <ShortName>Earnings from Discontinued Operations (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2401403 - Disclosure - Organization And Summary Of Significant Accounting Policies (Summary Of NNN's Investment Portfolio) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesSummaryOfNnnsInvestmentPortfolioDetails</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies (Summary Of NNN's Investment Portfolio) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2401404 - Disclosure - Organization And Summary Of Significant Accounting Policies (Gross Intangible Assets and Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesGrossIntangibleAssetsAndLiabilitiesDetails</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies (Gross Intangible Assets and Liabilities) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2401405 - Disclosure - Organization And Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesComputationOfBasicAndDilutedEarningsPerShareDetails</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2401406 - Disclosure - Organization And Summary Of Significant Accounting Policies (Changes in AOCI) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/OrganizationAndSummaryOfSignificantAccountingPoliciesChangesInAociDetails</Role>
      <ShortName>Organization And Summary Of Significant Accounting Policies (Changes in AOCI) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - Real Estate (Classification Of Investment Property Leases) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstateClassificationOfInvestmentPropertyLeasesDetails</Role>
      <ShortName>Real Estate (Classification Of Investment Property Leases) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - Real Estate (Summary Of Real Estate Subject To Operating Leases) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstateSummaryOfRealEstateSubjectToOperatingLeasesDetails</Role>
      <ShortName>Real Estate (Summary Of Real Estate Subject To Operating Leases) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2402404 - Disclosure - Real Estate (Held for Sale) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstateHeldForSaleDetails</Role>
      <ShortName>Real Estate (Held for Sale) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2402405 - Disclosure - Real Estate (Dispositions) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstateDispositionsDetails</Role>
      <ShortName>Real Estate (Dispositions) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2402406 - Disclosure - (Commitments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/CommitmentsDetails</Role>
      <ShortName>(Commitments) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2402407 - Disclosure - Real Estate (Impairments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/RealEstateImpairmentsDetails</Role>
      <ShortName>Real Estate (Impairments) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2404401 - Disclosure - Line of Credit Payable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/LineOfCreditPayableDetails</Role>
      <ShortName>Line of Credit Payable (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2406401 - Disclosure - Notes Payable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.nnnreit.com/role/NotesPayableDetails</Role>
      <ShortName>Notes Payable (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - Notes Payable - Convertible (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.nnnreit.com/role/NotesPayableConvertibleDetails</Role>
      <ShortName>Notes Payable - Convertible (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/StockholdersEquityDetails</Role>
      <ShortName>Stockholders' Equity (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Earnings from Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/EarningsFromDiscontinuedOperationsSummaryOfEarningsFromDiscontinuedOperationsDetails</Role>
      <ShortName>Earnings from Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2411401 - Disclosure - Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/DerivativesDetails</Role>
      <ShortName>Derivatives (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Fair Value Measurements (Reconciliation Of Residuals) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/FairValueMeasurementsReconciliationOfResidualsDetails</Role>
      <ShortName>Fair Value Measurements (Reconciliation Of Residuals) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2413401 - Disclosure - Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nnnreit.com/role/FairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_DebtInstrumentUnamortizedDiscount had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">'Monetary' elements on report '1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '2407402 - Disclosure - Notes Payable - Convertible (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '2411401 - Disclosure - Derivatives (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 1001000 - Statement - Condensed Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jun. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2012'</Log>
    <Log type="Info">Process Flow-Through: 1001501 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'May 31, 2013'</Log>
    <Log type="Info">Process Flow-Through: 1002000 - Statement - Condensed Consolidated Statements Of Comprehensive Income</Log>
    <Log type="Info">Process Flow-Through: 1004000 - Statement - Condensed Consolidated Statements Of Cash Flows</Log>
    <Log type="Info">Process Flow-Through: 1004501 - Statement - Condensed Consolidated Statements Of Cash Flows (Parenthetical)</Log>
  </Logs>
  <InputFiles>
    <File>nnn-20140630.xml</File>
    <File>nnn-20140630.xsd</File>
    <File>nnn-20140630_cal.xml</File>
    <File>nnn-20140630_def.xml</File>
    <File>nnn-20140630_lab.xml</File>
    <File>nnn-20140630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
